Typewriter



E. POPE TYPEWRITER Filed Dec.

Aug. 12, 1924.

E. POPE TYPEWRITER Aug. 12 1924.

2 Sheets-Sh eet 2 Filed Dec. 14, 1922 w nd wow in the same Patented Aug. 12,

UNITED STATES PATENT OFFICE.

'nnwnr Porn, or QUEBEC, QUEBEC, omens.

rrrswnrrna.

Application filed December 14, 1822. Serial No. 806,778.

To all whom it'may concern: Be it known that I, EDWIN Porn, a subject of the King of Great Britain, residing at Quebec, in the Province of Quebec, Dominion of Canada, have invented certain new and useful Improvements in Typewriters, of which the following is a specification.

My invention relates to that class of typewriters in which electric power is employed in connection with the movements of the printin elements, and my improvements-are directs after the movement of a type bar has been normally initiated, it is continued and the printing operation is completed by electrical power, thus reducing the muscular action and power otherwise required from the operator, and facilitating the ease, rapidity and uniformity of operation of themachine. In the drawings, Fig. 1 is a plan view of a machine illustratin an embodiment of my invention, the view being taken looking in the direction of the arrow on Fig. 2, parts only of the frame being shown, and only a few of the usual bank of key bars, and the portions of the typewriter not modified by my invention bein omitted; and Fig. 2 is I a cross sectional e evation, taken as on the line 22 of Fig. 1, looking, to the right.

Corresponding parts are designated by similar reference numerals in both the figures.

The operative parts of the typewriter are assembled upon a suitable base 1, provided with carryin standards 3, 3.

The base a so supports a pair of electromagnets 4, 4, prefer-a y disfposed at an angle from the .h'onzontal, the aces 5, 5, of the magnets being preferabl curved as shown. The forward ends of t e key bars 7, 7 are each recessed so as to form upper and'lo'wer projections 8,. 9, correspondmg rojections on the. severall key bars being a1 disposed ane. A rodor 'ar 10 is carried rotatably by and between the standards 3, 3 by adjustable pivot pins 11, 11, in the upper ends of the standards, set into sockets in the ends of the rod 10.

This rod 1.0 carries two flanges 12, 13, which extend the whole width of the bank 'of key bars 7, 7, while from the lower side of the rod 10, by arms 14, 15, is suspended an armature 16, which 1s adapted to be swung up into close proximity to the magnets 5,- 5: The rod, flanges and armature particularly to means whereby,

may be comprehensively referred to as an armature element.

A bar 20 is carried by arms 21, 21 termlnating in collars 22, 22, turning freely on the rod 10, but kept in proper position by collars 23, 23, or the like. The flange 12 is provided with an. extension 24, which extends over past the ri ht hand arm 21; and this arm 21 is normefily held against the extension 24 by suitable means such as'a coiled spring 25 interposed between it and the rod 10.

Mounted revolvably on the rod 10 is an arm30, provided with an insulated contact pin .31, normally bearing "against the arm 15, and completmg'a current from battery 32, line 33, pin 31, arm 15, rod 10, frame andbase 1 toline 34, the windings of magnets 5, 5, and line 35 to battery.

The armature 16 carries an extension 36 supporting a catch block 37, above which normally rests the end of a pawl 38, pivoted near the free end of the arm 30 and provided with a counterbalance weight 39, and a lateral lug 40 lying above an arm 41, carried by the right hand standard 3.

A suitable stop 45 is placed behind the armature 16 so as to arrest it in its normal, initial position. And another stop 46 limits the movement of the armature 16.

The operation of my machine is as follows When the o erator presses upon a key, as the key bar escends its projection 9 will press down the flange 13, swinging the armature 16 in toward the arm, brmging it under the influence of the magnets 5, 5. Simultaneously, the flange 12 swings in above the projection 9, releasing the arms 21, 21, and allowing the bar 20 to be swung forward above the projection 8 of the depressed key bar 7, but under the projections 8, 8, of the remaining key bars, so as to prevent their being depressed.

The depressions of the flange-13 swin the arms 14, 15, bringing their armature 6 into the field of the magnets 5, 5, which,

thereupon, draw the armature quick] upward toward them. This causes the ange 12 to engage above the projection 9 and res down the key bar, completing the stro e of I deenergizing the magnets 5, 5, the pawl 38,

dropping behind the catch block 37, which prevents the reclosing of the circuit until the key bars and leaving them all free for optional operation.

The arm drop's'back w thrthe arm 15, the lug' 40 of the pawl 38 being raised by the 'arm 41 so that the pawl will pass above the catch block 37, and will allow the pin 31 make contact with the arm 15 and again close the electric circuit.

By this arrangement only a very hght touch is required of the operator to initiate the rinting movement, the actual rintmg ent o'f fthe United States paper on the platen,- andout departing from the stro e being made by the force of t e magnets, which will actuate all the type bars with equal energy, thus not only minimizing the work of the operator, very uniform and even style of pr nting. The strength or number of the magnets, also,

may, be varied to secure the results bestadapted' for the particular work in hand. Thus, if manifolding is being done, more powerful magnets should-preferably be employed. And the machine may easily be ar'- ranged for this by lengthening the armature and mounting an additional magnet ormagnets in the frame beside those shown% and ewer arranging the wirin so that more or of the magnets may a e used as'desired. The magnets may be operated by an suitable form of battery, or other source 0 electrical power. And thetypewriter may also be operated by hand, if desired. I

e armature preferably passes the magnets very closely and andlthel mechanism is changes, such as varying the like.

It will be understood that details of con-' struction may be varied, as by the use of mechanicalequivalents, and the like, withspirit of m invention'a's described and claimed, the d iawings being intended to show an illustrative form of a mechanism embodying my improvements and not an exclusive type.

Having thus described my invention, what I 'claim' and'desire to-secure' byLetters Patis:- 1. The combination, in a etic field, of key bars each provided with a fixed engaging element, an armature element provided with fixed means initially engggeable directly by each key bar and movea e thereby to bring the armature into the but also insuring a ts their full power; ge adapted to slight,

.bodyin'g key bars, thicknesses of the.

typewriter, with means for producing aoontrolling ma magnetic field, and also provided with fixed means for directl engaging the fixed engaging element 0 eac ey bar and completing the stroke movement of each key bar through the influence of-the magnetic .field in the armature.

I 2. .The combination, in a tyfiewriter, with means for producing a contro magnetic field, of key bars each rovided with a fixed engaging element an a locking element,

an armature element provided with fixed meansinitially engageable directly, by each key bar and moveab e thereb to ring the armature into the magnetic el and also provided with fixed means for directly engagin and completing the stroke movement of eac ke bar through the influence of the magnetic eld in the armature, and ae arate, moveable, key locking means, contro led by the armature element.

3. The. combination, in a ty key bars each rovided with ing element an ture element engageable directly by each moveable thereb into the magnetic field and provided with xed means or directly engagin and completing the stroke movement of eac key bar, a source of electrical energy, an electric circuit containing an electromagnet, and means, controlled by the movement of the armature element, for opening and closin such'circuit.

4. he combination, in a ty writer embodying key bars, a normally 0 osed electric circuit provided with a switch, a source of electrical wer, electromagnets, and supplementary ey bar actuating means located in the electric circuit, of means associated with and initially actuated by the supplementary actuating means for opening the writer, of

l d engaga locking element," an armakey bar and bar.

stroke of a key ination,

5. The com in a ty ewriter em- 0 a normally closed'electric circuit provided w'th a switch, a source of electrical power,el tromag'n'ete, and sup lezmentary key bar actuating means loca in of means associated with the electric circuit, and initially actuated by the supplementary actuating means for opening the switch after the completion of the downwardstroke of a key bar and for automatically closing it again.

6. The combination, bodying moveable of key bars and keys, an electric circuit, a source of electrical power, electromagnets and supplementary bar actuating e ectric circuit, an

means, ocated inaaid means, associated with the supplementary for opening said type but actuating mea e ectric circuit at the 02d of each printing operation and for closing it before the bein a typewriter emginning of the next printing operation rovided with. means initially type bars and a platen,"

ammo

7. The combination, in a typewriter, em-

bodying manually operable key bars, supplementary key bar actuating means, a normally closed electric clrcult, energlzable means located therein, and a source of elec-- mentary'key bar actuating means5I-a nor-'- mally closed electric circuit, energizable meanslocated therein, and a source of electric energy located in the circuit, thezini-tial movement of the manually operable means acting to bring the supplementary means pro ressively from beyond towithin the field of t e energlzable means.

9. The combination, in

a typewriter embodyin manually operable key-bars, of a normal y closed electric circuit, an electromagnet located therein, supplementary, vunitary key bar actuatin meansembod mg; an armature adapted to ire field of said magnet and bein provided'with fixed passive means engagea le-by each ke bar on its downward movement, and wit fixed active means to engage and continue the movement of the key bar.

10. The combination, m a typewriter em bodying manually operable key bars, of. a-

normally closed electric circuit, an electrg; magnet located therein, a supplementary, single, common key bar actuating means embodying an armature adapted to be brought within the field of the electromagnet, passive means in fixed relation to the armature and engageable by each key bar and active means, also in fixed relation to the armature,

broughtwit "m the vide with a switch adapted to be opened said key bar, and key bar locking means governed by said active means.

11. The combination, in a typewriter em bodyin manually operable key bars, of a normally closed electric circuit, a source of electric energy located therein, an energizable element in said circuit, rotatable means normally beyond the influence of the energizable means, disposed between it and the key bars, and moveable by each key bar,

in its initial downward movement, into the range of influence of the energizable element, and actuable thereby to complete the movement of'the key bar.

12. The'combination, in a typewriter embodying key bars, of a normally closed electric circuit, containing a source of electric energy and energizable means, of rotatable means moveable by each key bar from beyond into the field of influence of the energizable means.

13. The combination, in a ty ewriter, with an electric circuit and means or reducing a controlling magnetic field therein, of key bars operatlvely connected directly with a swin in'g armature element which is proby its own momentum after the arrest of the movement ,of :the armature in one direction. I i

. 14. The combination, ina typewriter, with an electric circuit and means for producing a controlling magnetic field therein, of key bars operatively connected directly with aswinging armature element which is provided with a 'switch adapted to be closed bythe movement of the armature in one direction and to be opened by the momentum lofthe Switch upon the arrest of the armaai jruree movement.

EDWIN POPE. 

